Home / 20,721.40-28,595.58-11,289.76

Finding the Fourth Proportional to 20,721.40, 28,595.58 and 11,289.76

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Solution

The fourth proportional to 20,721.40, 28,595.58 and 11,289.76 is: 15,579.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,721.40 : 28,595.58 = 11,289.76 : x
  2. Step 2: Convert to fraction form
    20,721.40/28,595.58 = 11,289.76/x
  3. Step 3: Cross multiply
    20,721.40x = 28,595.58 × 11,289.76
  4. Step 4: Simplify right side
    20,721.40x = 322,837,235.26
  5. Step 5: Solve for x
    x = 322,837,235.26/20,721.40
  6. Step 6: Final answer
    x = 15,579.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.